--- product_id: 98378822 title: "Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable" price: "KD 312.94" currency: KWD in_stock: true reviews_count: 8 url: https://www.desertcart.com.kw/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in store_origin: KW region: Kuwait --- # Field-adjustable pressure 14-gallon capacity Copper-lined steel durability Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable **Price:** KD 312.94 **Availability:** ✅ In Stock ## Summary > 💧 Stay ahead of pressure spikes with Watts – where water safety meets smart design! ## Quick Answers - **What is this?** Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable - **How much does it cost?** KD 312.94 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.com.kw](https://www.desertcart.com.kw/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in) ## Best For - Customers looking for quality international products ## Why This Product - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Robust 14-Gallon Volume:** Handles thermal expansion with ample capacity to protect your water system. - • **Premium Copper-Lined Steel:** Ensures long-lasting durability and corrosion resistance for years of reliable use. - • **Pressure Relief Protection:** Keeps system pressure below T&P valve settings, preventing costly leaks or failures. - • **Field-Adjustable Pre-Charge:** Customize the 20 PSI pre-charge to perfectly balance your home's water pressure. - • **Certified Safety & Compliance:** IAPMO listed and ANSI/NSF 61 certified for peace of mind and top-tier quality. ## Overview The Watts PLT-35 Potable Water Expansion Tank is a 14-gallon, field-adjustable steel tank designed to absorb thermal expansion in residential water heaters. Pre-charged at 20 PSI and rated for up to 150 PSI, it features a copper-lined steel body with FDA-approved polypropylene liner and Butyl rubber diaphragm to prevent air-to-water contact, ensuring durability and system longevity. Certified to IAPMO and ANSI/NSF 61 standards, it maintains balanced water pressure to protect your plumbing system and prevent pressure relief valve activation. ## Description The Watts PLT Series Potable Water Expansion Tank is specifically designed for use with gas, oil, or electric direct-fired residential water heaters and hot water storage tanks to manage the increased volume of water caused by thermal expansion. This field-adjustable steel tank is pre-charged with air at 20 psi, has a substantial volume of 14 gallons, and features a 3/4 inch male inlet connection. With a maximum pressure rating of 150 psi (10 bar), it is built to handle significant pressure levels. The tank's construction includes a polypropylene liner and a Butyl rubber diaphragm, coupled with copper-lined steel and an expansion membrane that prevents air-to-water contact, ensuring extended system life. The Watts PLT Series tank helps save time and trouble by maintaining balanced pressure throughout the water supply system, keeping system pressure below the T&P relief valve setting. It is IAPMO listed and ANSI/NSF 61 certified, ensuring both quality and compliance with safety standards.At Watts, our family of brands offers one of the most varied product lines in the world. Simply put, if you're moving, removing, heating, treating, or reusing water, we have everything you need to get the job done. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. From melting ice on entire city blocks from the ground up, to filtering safe drinking water in isolated, weather disaster zones, you need water and water needs Watts. Review: Worked Just Fine! - OEM. Worked Just Fine! Review: Prevents pressure relief valve from firing - We got our pressure valve fixed and so had to install this to prevent the pressure relief valve from going off on the heater. This was easy to install and has clear instructions: 1: pump to the same pressure as the water pressure 2: install (no need to support it) It's pretty small so make sure to size it appropriately. We have had zero issue and everything is working just fine. ## Features - WATER EXPANSION TANK: The Watts PLT Series potable water expansion tank is used on gas, oil, or electric, direct-fired, residential water heater and hot water storage tank applications to absorb the increased volume of water created by thermal expansion. - COMPREHENSIVE FEATURES: This field-adjustable steel tank is air pre-charged at 20 psi, has a volume of 14 gallons, and 3/4 inch male inlet connection. The maximum pressure is 150 psi (10 bar). - DURABLE CONSTRUCTION: Designed with a Food and Drug Administration-approved polypropylene liner and Butyl rubber diaphragm, copper-lined steel, and an expansion membrane that prevents air-to-water contact in the tank, ensuring a long system life. - SAVE TIME AND TROUBLE: Our potable water expansion tank also maintains balanced pressure throughout the water supply system by keeping system pressure below the T&P relief valve setting. IAPMO listed and ANSI/NSF 61 certified. - EVERY DROP COUNTS: Water. It's in our name and close to our hearts. Since 1874, Watts Water Technologies has been delivering innovative technologies that make the world's most precious resource safe and accessible. Everything we design is made to keep the Earth's most precious resource safer, cleaner, and more useful for our customers. Our family of brands offers one of the most varied product lines in the world, with world-class, water-related solutions. ## Technical Specifications | Specification | Value | |---------------|-------| | Customer Reviews | 4.6 out of 5 stars 439 Reviews | ## Images ![Watts PLT-35 Potable Water Expansion Tank, 3/4 In Male Inlet Connection, 14 Gallon Tank Volume, Pre-Charged at 20 PSI, Copper-lined Steel, 150 PSI Max, Field Adjustable - Image 1](https://m.media-amazon.com/images/I/51iYI8dZ7LL.jpg) ## Available Options This product comes in different **Size, Style** options. ## Customer Reviews ### ⭐⭐⭐⭐⭐ Worked Just Fine! *by K***T on December 20, 2025* OEM. Worked Just Fine! ### ⭐⭐⭐⭐⭐ Prevents pressure relief valve from firing *by B***D on January 1, 2024* We got our pressure valve fixed and so had to install this to prevent the pressure relief valve from going off on the heater. This was easy to install and has clear instructions: 1: pump to the same pressure as the water pressure 2: install (no need to support it) It's pretty small so make sure to size it appropriately. We have had zero issue and everything is working just fine. ### ⭐⭐⭐⭐⭐ Good quality Tank- paint and threads. *by C***G on September 14, 2020* The tank arrived on time and in good condition. Installation was easy. The tank paint and threads were all good quality. It was installed to reduce water pressure changes on my hot water tank. The pressure relief valve was periodically leaking and the expansion tank resolved the problem. --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.com.kw/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in](https://www.desertcart.com.kw/products/98378822-watts-plt-35-potable-water-expansion-tank-3-4-in) --- *Product available on Desertcart Kuwait* *Store origin: KW* *Last updated: 2026-05-21*